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Open AccessArticle

On Nonlinear Bending Study of a Piezo-Flexomagnetic Nanobeam Based on an Analytical-Numerical Solution

1
Department of Mechanics of Materials and Structures, Faculty of Civil and Environmental Engineering, Gdansk University of Technology, 80-233 Gdansk, Poland
2
Laboratory of Mechanics of Biomaterials, Research and Education Center “Materials”, Don State Technical University, Gagarina sq., 1, Rostov on Don 344000, Russia
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(9), 1762; https://doi.org/10.3390/nano10091762
Received: 19 July 2020 / Revised: 30 August 2020 / Accepted: 4 September 2020 / Published: 6 September 2020
(This article belongs to the Special Issue Advances in Micro- and Nanomechanics)
Among various magneto-elastic phenomena, flexomagnetic (FM) coupling can be defined as a dependence between strain gradient and magnetic polarization and, contrariwise, elastic strain and magnetic field gradient. This feature is a higher-order one than piezomagnetic, which is the magnetic response to strain. At the nanoscale, where large strain gradients are expected, the FM effect is significant and could be even dominant. In this article, we develop a model of a simultaneously coupled piezomagnetic–flexomagnetic nanosized Euler–Bernoulli beam and solve the corresponding problems. In order to evaluate the FM on the nanoscale, the well-known nonlocal model of strain gradient (NSGT) is implemented, by which the nanosize beam can be transferred into a continuum framework. To access the equations of nonlinear bending, we use the variational formulation. Converting the nonlinear system of differential equations into algebraic ones makes the solution simpler. This is performed by the Galerkin weighted residual method (GWRM) for three conditions of ends, that is to say clamp, free, and pinned (simply supported). Then, the system of nonlinear algebraic equations is solved on the basis of the Newton–Raphson iteration technique (NRT) which brings about numerical values of nonlinear deflections. We discovered that the FM effect causes the reduction in deflections in the piezo-flexomagnetic nanobeam. View Full-Text
Keywords: flexomagnetic; nanobeam; large deflection; NSGT; Galerkin method; Newton–Raphson method flexomagnetic; nanobeam; large deflection; NSGT; Galerkin method; Newton–Raphson method
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Malikan, M.; Eremeyev, V.A. On Nonlinear Bending Study of a Piezo-Flexomagnetic Nanobeam Based on an Analytical-Numerical Solution. Nanomaterials 2020, 10, 1762.

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